Thoms Effect as Influenced by the Concentration and Molecular Parameters of the Cationic Copolymer of Acrylamide

The Thoms effect observed with water-soluble cationic copolymer of acrylamide was studied in relation to the concentration, molecular weight, and molecular weight polydispersity of the polymeric additive, with its composition and composition polydispersity being constant.     

Toms Effect as Influenced by the Glass Capillary Length and Diameter

The degree of reduction of the hydraulic resistance was studied as influenced by the concentration of the anionic copolymer of acrylamide, geometric parameters of the contour, and turbulent flow velocity.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 4, 2005, pp. 669–672.Original Russian Text Copyright © 2005 by Chichkanov, Myagchenkov.     

Toms Effect in Direct Crude Oil Emulsions as Influenced by the Stream Velocity and Concentration of Anionic Copolymers of Acrylamide

The major relationships in the Toms effect in direct crude oil emulsions differing in the dispersed phase concentration were studied on a modified turbulent rheometer with anionic copolymer of acrylamide as the polymer additive. The Toms effect was studied as influenced by the polymeric additive concentration and shear stress.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 3, 2005, pp. 506–511.Original Russian Text Copyright © 2005 by Myagchenkov, Chichkanov, Yakovenko.     

Toms Effect in Model and Real Systems

Selected data on use of macromolecular compounds (polymers) as additives that diminish the hydraulic resistance of turbulent fluid flows (Toms effect) are presented. Theoretical and applied (concerning mainly oil production) aspects of the phenomenon are considered.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 4, 2005, pp. 529–544.Original Russian Text Copyright © 2005 by Myagchenkov, Chichkanov.     

Influence of Concentration and Molecular Characteristics of Copolymers of Acrylamide with Sodium Acrylate on the Thoms Effect in Oil-in-Water Emulsions

The effect of the concentration and molecular parameters of random copolymers of acrylamide and sodium acrylate on their performance as additives reducing the hydraulic resistance of turbulent flows in oil-in-water emulsions is quantitatively studied.     

Effect of water-soluble polymeric additives on energy expenditure in transportation of water-oil systems in turbulent mode

New installation of the circulation type was used to perform a joint analysis of rheological and energy parameters of turbulent flows of water and water-oil media in the presence of polymeric additives of anionic copolymers of acrylamide. Copolymers with varied molecular mass were produced by ultrasonic destruction of a starting high-molecular-weight sample of the polymer under mild conditions. The effect of the molecular mass of the polymer additive on the specific energy expenditure in the case of circulation of water-oil media in the turbulent mode was analyzed.     

Influence of the Concentration of Ionic Acrylamide Copolymers,Ionic Strength,and Kind of the Electrolyte on the Thoms Effect

The influence exerted by the copolymer concentration, ionic strength, and kind of single- and multicharged ions on the reduced Thoms effect was examined for ionic acrylamide copolymers as additives reduciong the hydraulic resistance of turbulent aqueous-salt flows. Synergism and antagonism were detected for certain combinations of the polymer and electrolytes.